Gammu command line utility provides access to wide range of phone
features, however support level differs from phone to phone and you
might want to check Gammu Phone Database for user experiences with
various phones. Generally following features are supported:
     * Call listing, initiating and handling
     * SMS retrieval, backup and sending
     * MMS retrieval
     * Phonebook listing, export and import (also from standard
       formats such as vCard)
     * Calendar and tasks listing, export and import (also from
       standard formats such as vCalendar or iCalendar)
     * Retrieval of phone and network information
     * Access to phone file system.
